This is brilliant! A great painterly technique and good composition. However, if I may offer a small constructive criticism. Her face feels too small for her body, perhaps also her head (although thats not too visible under the mass of hair). Heres something to remember, something Leonardo Da Vinci taught:

The face is roughly the same size as a spread out hand.

If you opened your hand (like a high five) and put it to your facem, you'll notice that this is true, its about the same size. In this painting her face is the same size as her closed fist, far too small!

Its the little details on her gloves against the broad strokes of her dress that I like best. Well that and her littleexpressive face. She might be struggling to hold that massive sword up, but you take one step closer and she'll hack off your arm. Awesome.

One thing I've been told many times before, one thing that many famous illustrators have mastered, is that the most important parts of the figure are the face and hands, they are the parts that are the most expressive and require the most detail. Everything else can be vague and brushy, so long as the face and hands are sharp.